chore: upgrade VitePress and pin patched transitive deps (#190)

Bump VitePress to 2.0.0-alpha.19 with Vite 8, pin postcss/nanoid/esbuild,
and raise the local-search chunk warning limit for this large doc set.

Author: yanglbme

docs/.vitepress/config.mts

@@ -515,5 +515,10 @@ export default defineConfig({
     socialLinks: [
       { icon: 'github', link: 'https://github.com/doocs/source-code-hunter' }
     ],
-  }
+  },
+  vite: {
+    build: {
+      chunkSizeWarningLimit: 2000,
+    },
+  },
 })

package.json

@@ -3,6 +3,9 @@
   "version": "1.0.0",
   "private": true,
   "packageManager": "pnpm@11.9.0",
+  "engines": {
+    "node": "^20.19.0 || >=22.12.0"
+  },
   "scripts": {
     "docs:dev": "vitepress dev docs",
     "docs:build": "vitepress build docs",
@@ -12,6 +15,6 @@
     "vitepress-plugin-comment-with-giscus": "^1.1.15"
   },
   "devDependencies": {
-    "vitepress": "2.0.0-alpha.17"
+    "vitepress": "2.0.0-alpha.19"
   }
 }